diff --git a/src/net.h b/src/net.h
index 6cae35e8e0..7801bedf46 100644
--- a/src/net.h
+++ b/src/net.h
@@ -52,7 +52,7 @@ static const unsigned int MAX_LOCATOR_SZ = 101;
 /** The maximum number of new addresses to accumulate before announcing. */
 static const unsigned int MAX_ADDR_TO_SEND = 1000;
 /** Maximum length of incoming protocol messages (no message over 4 MB is currently acceptable). */
-static const unsigned int MAX_PROTOCOL_MESSAGE_LENGTH = 4 * 1000 * 1000;
+static const unsigned int MAX_PROTOCOL_MESSAGE_LENGTH = 16 * 1000 * 1000;
 /** Maximum length of strSubVer in `version` message */
 static const unsigned int MAX_SUBVERSION_LENGTH = 256;
 /** Maximum number of automatic outgoing nodes */
diff --git a/test/bitcoin_functional/functional/p2p_invalid_messages.py b/test/bitcoin_functional/functional/p2p_invalid_messages.py
index 700fdf6e04..d30900eba3 100755
--- a/test/bitcoin_functional/functional/p2p_invalid_messages.py
+++ b/test/bitcoin_functional/functional/p2p_invalid_messages.py
@@ -52,7 +52,7 @@ class InvalidMessagesTest(BitcoinTestFramework):
         node.add_p2p_connection(P2PDataStore())
         conn2 = node.add_p2p_connection(P2PDataStore())
 
-        msg_limit = 4 * 1000 * 1000  # 4MB, per MAX_PROTOCOL_MESSAGE_LENGTH
+        msg_limit = 16 * 1000 * 1000  # 16MB, per MAX_PROTOCOL_MESSAGE_LENGTH
         valid_data_limit = msg_limit - 5  # Account for the 4-byte length prefix
 
         #
diff --git a/test/functional/p2p_invalid_messages.py b/test/functional/p2p_invalid_messages.py
index 700fdf6e04..d30900eba3 100755
--- a/test/functional/p2p_invalid_messages.py
+++ b/test/functional/p2p_invalid_messages.py
@@ -52,7 +52,7 @@ class InvalidMessagesTest(BitcoinTestFramework):
         node.add_p2p_connection(P2PDataStore())
         conn2 = node.add_p2p_connection(P2PDataStore())
 
-        msg_limit = 4 * 1000 * 1000  # 4MB, per MAX_PROTOCOL_MESSAGE_LENGTH
+        msg_limit = 16 * 1000 * 1000  # 16MB, per MAX_PROTOCOL_MESSAGE_LENGTH
         valid_data_limit = msg_limit - 5  # Account for the 4-byte length prefix
 
         #